{
  "manageEntity": {
    "action": "Save",
    "entityId": "603725508",
    "entityType": "Track",
    "nonce": "0xf549798e397aaeef2dbc2be4c94fe7f0d483f5a0ac2a08ebbc5390d7763d3c9d",
    "signature": "0x0ddae3acb10b898b3b8dc108ffdeb72eb5e36e14dbc3537e11a45a931390c96260404221d068023fb39f171f0d3a993aa4093d8c38c48473dca465b92f2ec9181c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}